It looks like the function wds_bp_registration_options_bp_before_member_header is missing in plugins/bp-registration-options/includes/core.php. The offending code is at line 200 and just seems to be used for outputting a custom message at the top of the member profile page. I have commented line 200 out on my site and it seems to work ok after that. No guarantees for your own site, though, and a proper fix by the plugin developers would be best.
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